Fluid-pressure-operated grinding-machine.



No. 876,428. PATENTED JAN. 14, 1908.

. J. G. BLESSING.

FLUT PRESSURE OPERATED GRINDING MACHINE.

APPLICATION FILED MAR. 16, 1907.

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No. 876,428. PAT

. J. G. BLESSING. ENTED 1 1908- FLUID PRESSURE OPERATED GRINDINGMACHINE.

APPLICATION FILED MAR.16, 1907.

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FLUID PRESSURE OPERATED GRINDING MACHINE. PPPPPPPPPPPPPPPPP AR.16,1907.

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PATENTED JAN. 14, 1908.

No. 876,428. PATENTED-JAN. 14, 1908. J. G. BLESSING.

FLUID PRESSURE OPERATED GRINDING MACHINE.

APPLICATION FILED MAR. 16, 1907.

4 SHEETSSHEET 4.

I I v .Z7EW6722%715 Lfogrz UNITED STATES PATENT OFFICE.

JOHN G. BLESSING, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO AMERICANCUTLERY COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

FLUID-BRESSURE-OPERATED GRINDING-MACHINE.

Specification of Letters Patent.

Patented Jan. 14, 1908.

"A lican filed March 16. 1907. Serial No. 362.656.

To all whom it may-concern:

Be it known that 1, JOHN G. BLESSING, a citizen of the United States,residing at New Britain, inthe county of Hartford and State ofConnecticut, have invented a new and useful Improvement inFluid-Pressure- O erated Grinding-Machines, of which the fo lowing is aspecification.

My invention relates to improvements in fluid-pressure-operated grindingmachines, and more particularly to the class in which the grinding isperformed in a single reciprocation of the work-carrier.

Mypresent invention is in the nature of an improvement u on theconstruction shown, described an( claimed in an application filed by meApril 17, 1906, and bearing v Serial No. 312,112.

In its general construction and operation the present machine is verysimilar to that shown in my former application referred to; and mypresent object 18 to provide certain improvements in the construction ofthe fluid-pressure motor-device which reciprocates the work-carrier, tothe end of adapting the machine more perfectly to its purpose. I

Referring to the accompanying drawings,

"which illustrate the preferred embodiment of my invention, Fi ure 1 isa broken top plan view of a knifelade grinding machine constructed withmy improved motor and carrier sw1n mg mechanism; Flg. 2, an

,enlarged bro en fragmentary view in side elevation of the fluidressuremotor; Fig. 3, a broken longitudina section of the same; Fig. 4, an endview of the motor; Figs. 5 and 6, sections taken respectively on lines 5and 6 in Fig. 3, and viewed in the direction of the arrows; Fig. 7, abroken, partly sectional, view showing in side elevation, mechanism forshifting the motor-valve to reverse themovement of the work-carrier,

as well as means for movinglthe reciprocating V work-carrier laterallywit relation to'the grinding-wheel; Figs. 8 and 9, views the same asFig. 7, but showing the moving parts in diiferent positions; and Fig.10, an enlarged and broken fragmentary viewshowing the connectionbetween the motor-starting lever and the motor-reversing valve.

The main frame of the machine is formed at its upper side with a waterreceptacle or. basin 11 in which the usual hollowcylindricalgrinding-wheel 12 rotates. The grinding-wheel has an inwardly-taperingannular grinding surface 13 and rotates constantly. 14 is a horizontalbase-plate adjustably pivoted at 15 to the main frame 11 to swing on itspivot to a limited extent toward and away from the grinding-wheel.Secured upon the plate 14 are perforated lugs 16, 17, forming guides fora longitudinally movable A rod. 18. Parallel with the rod 18 is astationary guide rod 19 mounted at opposite ends in lugs 20 and 21rising from the plate 14.

22 is a work-holder carrier extending parallel with the rods 18, 19,having a flanged end portion 23 receiving and fastened to the rod 18 andterminating at its opposite end in a cross-head 24 having openingsthrough which the rods 18, 19 pass. The cross-head slides freely uponthe guide-rod 19. Secured upon the plate 14, in the positions shown, areheads 25 and 26 for a cylinder 27; and extending through the heads,above the cylinder, is a tube or valve-chamber 28 closed at one end andprovided at its opposite end with a stuffing-box 29. Extending throughthe stufling-box and working in the valvechamber 28 is a valve-rod 30provided with pistons 31 and 32 in the relative positions shown.Extending into the tube 28, be-

tween the pistons 31, 32, is a fluid-pressure supplyassage 33 connectedin practice by a rubber liose, or the like, with a fluid-pressuresupplier, not shown. In the head 25 is a port 34 affording communicationbetween the interior of the tube 28 and interior of the .cylinder 27 atone end. Adjacent to the port 34 is a port 35 cored in the head 25 andcommunicating at one end with the interior of the tiibe 28 and at itsopposite end wlth a pipe 36 extending, parallel with the lower side ofthe cylinder, through the head 26, beyond which it is provided with acook or faucet 37 provided with a rotary plug-valve 38. In the head 26is a cored passage or port 39, communicating at one end with theinterior of the tube 28 and at its opposite end with the cylinder 27,and a port or passage 40 extending from the interior of the tube 28 to apipe 41 provided with a cook or faucet 42 having a rotary plug-valve 43.

44 is an operating lever or handle pivoted at 45 upon the stationary lug16 and pivotally connected between its ends, as shown in Fig. 16, to alink 46 extending from a head. 47

and head 47 is a spring 48 which tends nor mally to shift the stem andits pistons 31 and 32 in the direction to the right in Figs. 1, 2 and 3.Working in the cylinder 27 is a piston 49 on a stem 50 passing through astuffing-box 51 in-the head 26 and secured at its outer end to thecross-head 24. I

The pistons 31.and 32 are in effect slide valves, which, in the slidingof the stem 30, open and close the end ports inthe tube or valve-chamber28. When in the position shown in Fig. 3, the valves 31 and 32 open theport 34 to the tube, close the port 35, and open the passage from thecylinder through t eports 39 and 40 to the faucet 42. When in thisposition, motive fluid asses from the port 33 through the tube anti port34 to the cylinder to drive the iston 49 in the direction of the head26, t e fluid in advance of the piston escaping through the faucet 42.Movement'of the stem to the right, until the valve 32 covers, the port40, o ens the passage 39 to admit the motive uid into that end of thecylinderand o ens the passage through the ports 34, 35 or the escape offluid from the cylinder therethrough and through the pipe 36 to thefaucet 37, whereby the piston 49 will be moved to the left.

.32 covers theport 40 and the 'tacts with the stop 55.

The piston 49, through its stem 50, moves the cross-head 24 andwork-holder carrier 22 longitudinally with the guide-rod 18, whilesliding upon the guide-rod 19. he carrier 22 carries an adjustableworkholder bar 52 of the construction shown and described in myaforesaidpending ap lication. It will suflice to say that the ar is adapted toreceive and hold a knife-blade 53 placed against its face.

The handle 44, in "its movement slides upon a bar 54, the bar beingmounted upon the lug 20. The tendency of the spring 48 is to move thestem 30 until the piston or valve andle 44 con- This is the normalposition of the parts, and the piston 49 comes to rest in the positionshown in Fig. 3. The

operation of the reciprocating work-carrier is started by moving thehandle 44 to the stop 56, and means are provided for ermitting thespring 48 to reverse the va ves 31 and 32 and the movement of. thepiston 49 when the latter reaches the limit of its movement in thedirection of the head 26. These means will be next described;

Beneath the guide-bar 19 is a rod 57 which slides longitudinally inguide openings in the lugs 20 and 21. The rod carries an ad'ustable heador stop 58 at one end beyon the lug 20 and adjustable stops or collars59 and 60 between the lugs in the path ofthe crosshead 24. 61 is a bentrod or catch-device pivoted u on the 11 per end of the lug 20and aving aorizonta ly-extending arm formed engaging the lever 44, and a downwardlyamaze the direction to the right in Fig. 1. As the cross-head nears thelimit of its movement in that direction, it engages the stop 60 andslides the rod 57 first to the position shown in Fig. 8, to cause thestop 58 to contact with the arm 63, and then to the position shown inFig. 9, to swing the catch and lift the sh0uldered ortion 62 to releasethe handle 44. This re ease of the handle permits the spring 48 toreverse valves 31, 32 and the movementof the piston 49, which latter isthen forced to the left, to the position shown in Fig. 3, where it,stops. In the movement of the carrier. to the right, the knife-blade 53is held out of contact with the grinding-wheel 12 and is moved intocontact with the latter during the final movement of the parts in thatdirection, whereby the grinding isxperformed in the outward movement ofthe parts which is in a direction to the left in. Fi .1.

- is before stated, the plate 14 is pivoted at 15. Resting on the uppersurface of the plate 14 and pivoted at one end upon a pin 64 carried bythe plate 14, is a lever 65 rovided in its swinging end-porti on with ane ongated segmental slot 66 engaging a pin 67 fastened to and rising;through 14, from a bracket 68 adjustably secured to the side-of the base11, as by a screw-bolt 69, to adapt it to be shifted with its pin 67transversely of the bed 14: The lever is pivotally connected at one endto a projection 70 on the adjacent end of the rod 57. In the movement ofthe said rod 57 to the left in the figures, for the movement of thecarrier as described, it

forces the lever 65 to the position shown in an opening in the bed Fig.1 with the effect of swinging the plate 14 on its pivot to move theknife-blade 53 out of contact with the grinding-wheel as indicated.- Asthe carrier nears the limit of its movement to the right, it forces therod 57, by

'105 purpose of reversing the a contact therewith of the cross-head 24,to

the position shown in Fig. 9 and drawsthe lever 65, whereby theengagement of the slot 66 with the. in 67 swings the plate 14 to pressthe knifelade into contact with the grinding face of the grinding-wheel.Thus, when the knife-blade is inserted in the carrier it is moved inwardnearly tofthe limit in that direction out-0f contact with thegrinding-wheel, then pressed into en agement with the grinding-Wheel,and uring its movement in the outward direction remains pressed againstthegrinding-"wheel to per mit the grinding o eration to be performed.

The motive flui I prefer to employ is water which escapes from thefaucets 37, 42

through an opening 71 in the base-plate 14 into the basin in which thegrinding-wheel, rotates. The speed of movement of the piston 49 ineither direction is controlled by the back-pressure of the escapingfluid ahead. Thus by turning the plug-valves at the fancets to diminishor enlarge the fluid outlets the speed of reciprocation of thework-carrier may be increased or diminished by the atten dant, asdesired. For example, by opening wide the cook 43, and partly closingthe cock 38, the carrier may be caused in each opera.- tion to move atmaximum in the inward direction, and at comparatively slow speed in theoutward direction while the grinding is being performed. The bestresults in grinding knife-blades, for example, are obtained by grindingin but one direction and moving the work at a certain speed withreference to the speed of rotation of the grinding-wheel. Myimprovements permit the movements of the carrier to be readilycontrolled to effect the best results. The pipes 36, 41, andvalve-chamber 28 also operate to hold the heads 25, 26 in fixed relationto each other, thereby dispensing with the use of tie-rods.

What I claim as new, and desire to secure by Letters Patent, is

1. In combination with a grinding-wheel and a reciprocal work-holdercooperating therewith, fluid-pressure means for operating saidwork-holder comprising a cylinder, a piston in said cylinder directlyconnected with the work-holder, a valve-chamber, fluidpressure inletsand outlets leading from said valve-chamber to said cylinder, and aslidevalve in said valve chamber for controlling the opening and closingof said inlets and outlets.

2. In combination with a grinding-wheel and a reci rocal work-holdercooperating therewith, fluid-pressure means-for operating saidwork-holder comprising a cylinder, a piston in said cylinder directlyconnected with the work-holder, a valve-chamber, fluid pressure inletand outlet passages at opposite ends of said cylinder leading from saidcylinder through the valve-chamber, a slidevalve in said valve-chamberprovided with spaced pistons for controlling the admission into anddischarge from the cylinder of the actuating fluid, and means foractuating the valve.

3. In combination with a grinding-wheel and a reciprocal work-holdercooperating therewith, fluid -pressure operating-means for saidworkholder comprising a cylinder, a piston in said cylinder directlyconnected with the work-holder, a valve-chamber, a fluid-pressure inletpassage leading from said chamber to the cvlinder, and a fluid-dischargeoutlet for the cylinder in said valvecharnber adiacent to said inlet. afluid-pressure inlet passage at the opposite end of the cylinder leadinginto it from said valvechamber and a fluid-pressure outlet in saidvalve-chamber adjacent to said last-named inlet, a slide valve in saidvalve-chamber comprising a rod and spaced pistons, fluidpressure inletand outlet ports for the cylinder in each end portion of said chamber, avalve rod, slide valves on the rod for opening and closing-the ports ateach end of the chamber alternately, and reciprocating means for therod.

4. In combination with a grinding-wheel and a reciprocal work-holdercooperating therewith, fluid-pressure operating means for saidwork-holder comprising a cylinder, a piston in said cylinder directlyconnected with the work-holder, a valve-chamber, fluidpressure inletsand outlets leading from said valve-chamber to said cylinder, aslide-valve device in said valve-chamber for controlling the opening and.closing of said inlets and outlets, and means for shifting theslidevalve to reverse the travel of the piston inthe final movement ofthe work-holder in one direction.

5. In combination with a grinding-wheel and a reciprocal work -.holdercooperating therewith, fluid-pressure operating means for saidwork-holder comprising a cylinder, a piston in said cylinder connectedwith the work-holder, a valve-chamber, fluid-pressure inlets and outletsleading from said valvechamber to said cylinder, a spring-controlledslide-valve in said valve-chamber for controlling the opening andclosingof said inlets and outlets, catch-mechanism for releasably maintainingsaid slide-valves in one position against the tension of its spring, andmeans actuated by said work-holder for engaging said catch'to free thevalve and allow it to return under the action of its spring to normalcondition.

6. In combination with a grinding-wheel and. a reciprocalwork-holder-cooperating therewith, fluid-pressure operating means forsaid work-holder comprising a cylinder, a piston in said cylinderconnected with the work-holder, a valve-chamber, fluid-pressure inletsand outlets affording communication between said cylinder andvalve-chamber, a spring controlled slide-valve in said valvechambergoverning the opening and closing of said inlets and outlets, and meansfor actuating the slide-valve comprising an operating lever connectedwith said slidevalve for moving it against the tension-0f its spring,catch-mechanism for releasably maintaining said lever in shiftedposition, and means actuated by the work-holder during its movement inone direction to engage said catch-mechanism to release it and causesaid lever and slide-valve to be returned by the spring to their normalpositions.

7. In combination with a grinding-wheel and a reciprocal work-holdercooperating therewith, fluid-pressure means for operating saidwork-holder comprising a cylinder,

a piston in said cylinder connected with the work-holder, avalve-chamber, fluid-pressure inlets and outlets afiordin communicationbetween said cylinder an valve-chamber,

a spring-controlled slide-valve in said valvechamber for controllin theopening and closing of said inlets and outlets, and means for actuatingtheslide-valve comprising a lever fulcrumed near one end to a sup ortand pivotally. fastened between its on s to said slide-valve for movingsaid valveagainst the resistance of said spring, a lever fulcrumed onthe machine havin a catch normally in the path of the lever i'y whichsaid lever is releasably held in shifted condition, and means movablewith said work holder for engaging said lever to move the catch andrelease the lever to ermit it and the slide-valve to be returned by thespring to their normal positions. i

8. In combination with a grinding-wheel and a reciprocal WOIk-I10ld61cooperating therewith, fluidcomprising a cy inder having heads providedwith fluid-pressure passages, spentfiuid discharge pipes, avalve-chamber proressure operating meansv vided with inlets and outlets,said heads being held to ether in fixed relation to each other by saipipes and valve-chamber, a piston in said cylinder operatively connectedWith the Work-holder, and a valve in said with the Work-holder, avalve-chamber, a

fluidpassage in one cylinder-head opening into said cylinder and intothe valve-chamber, a fluid-passage in the opposite cylinderhead openininto said cylinder and valvechamber an a s ent-fluid passage in saidlast-named cylin er-head leading from said valve-chamber to exhaust, anda valve in said valve-chamber controlling the opening and closing ofsaid assa es.

G. BLESSING. In presence of- M. G. LEEKI'N, F. T. PUNDERSON.

